Rear compartment lock



4 Sheets-Sheet 1 Filed June 5, 1950 niiimliinm Edward Oct. 13, 1953 E. N. JACOB! REAR COMPARTMENT LOCK 4 Sheets-Sheet 2 Filed June 5, 1950 E0 arr/ AZ Jar/10b; 051

Oct. 13, 1953 E. N. JACOB] REAR COMPARTMENT LOCK 4 Sheets-Sheet 3 Filed June 5, 1950 Oct. 13, 1953 E. N. JACOB! REAR COMPARTMENT LOCK 4 sheets eet 4 Filed Ju 5 950 Patented Oct. 13, 1953 LOCK Edward 1N. Jacobi, Milwaukee, vWis assignor to Bri s .& St etmn 0on1" screen n 'nd rst Milwaukee entertained ????1 N2- 16.6??? 16 .Glaim (0 29:36?)

This invention relates .to locks and refers more particularly to automobile door iocks of the type known as pillar locks. The characteristic feature of a pillar lock resides in the provision of a driving or eperating shaft which is coupled with tniqck'eyunder and projects axially rearwardly therefromte transmit rotation of the cylinder to'a door latch mechanism to be actuated. In mostiristances it is very desirable'to so' connect the lock eylinder with the driving shaft as to afford the shaft a limited degree of universal motion to'thus enable it to compensate for misalignment betw en the loci; casing and the latch mechanism on U he door Y v H Relatively simple connections between the driving shaft and the lock cylinder'haveheretofore been devised which embody provision f 'or such universal motion, "but'the' "drive shafts' o'f sueh structures have'her'etofore had to be fabricate b other than a stamping operation since w 4 relatively complex in shape'and cguld not be formed as a flat or strip like'memben ample of the previous'type of driving shaft'of this character is to be foundinthecopending appl tion of Edward N. Jacobi, Serial'NQYlIb QQZ filed September 3, 1949, now Patent' llo 2,6 0 5", 6 3'1.

It is therefore an object'of this inven on to provide a pillar lock having its driving shaft fabricated as an extremely simple and inexpensive stamping but nevertheless providing a connection between the driving'shaftand the loci; cylinder which affords a degree of universal motion to the driving shaft.

Another object of this invention resides the provision of a pillar lock havmge universal ieint connection between the lock'icylinder and the driving shaft and wherein the portiori'of the connection associated with the lock cyl'inderinay be formed as a very simple'die' casting whieh is' in} tegral with the lock cylinder and does not ne V seitate complicated coring;

A further object of this invention is to provide a connection between the driving shaft and'th'e lock cylinder of a pillar lock wmeneonne tibi; will be held operative by means of a coiled pring which also serves to bias the lock cylinder to its neutral or key-receiving position of rotation."

Still another object of" this inventio'n resides in the provision of a pillar lock having a connection between the lock cylinder and the driving shaft whereby the shaft will be yieldably held coaxial with the cylinder, extending straight rearwardly therefrom, to facilitate its installation; but W l b c pable f a mited degree. of universal 2 motion, to thus compensate for any misalignment between the lock mechanism and the latch mechanism to be actuated thereby.

Another object ofthis invention resides in the provision of a pillar lock in which the lock cylinder is held against axial displacement by means of a bayonet connection and'in which rotation of the lock cylinder to a position at which the bay- I chat connection becomes disengaged is precluded by means of apart of the'driving shaft.

'W-ith the above and other objects in view which will appear'a s thedes'cription proceeds, this invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described, andinore particularly defined'bythe appended claims; it being understood that such' changes in the precise embodiment of the herein disclosed invention may be made as come within'the scope of the claims. "The accompanying" drawings illustrate one complete example'ofthe physical embodiment of the invention eonstructed"inaccordance with the best mode so far devised fer the practical application ofthe principles thereof and in which Figure 1"is aside elevational' view of a pillar lock embodying the principles of this invention; Figure 2 is"; bottom viewer the Figure 1' pillar locks? V V Figure 3 is a rear elevational view of the pillar lockibffigurelfww Figure fisa view in section taken on the plane of the line 44m igure'r the lock cylinder in renewa or 'key "ving position;

e ew yew e e i9 Fi 4 ut wi i w f l qk c inde re th ou h t n ma tievelfi .t latch 9. as o unleckins position;

ve View of thelocl; easing "Figure 6 is ap'erspecn 9 hi i tio F i 74S a" afoul? perspec ive vi of h d vingshaft and'locl; c "nldeh ""Fis rgi is a s de fil r?! Par ia in sectio shew s the uni ersal s n ti be wee h driving shaft and the lock cylinder of this inventiqn; n

Figures 9,-1.0 and 11 are rear .views of a portion of the lock casing with the cylinder therein in the several successive positions which it occupies during its assembly into the casing.

Referring now more particularly to the accompanying drawings, in which like numerals designate like parts throughout the several views, the

der mechanism 1 is rotatably received. The lock meme 3 cylinder mechanism may be of any conventional type, that illustrated being the well-known side locking bar type which is freed for rotation upon the insertion of a key 8 therein. The key receiving slot in the lock cylinder is, of course, accessible at the front of the casing and may be covered by a dust cover 9, if desired, to preclude the entry of rain and foreign matter into the lock mechanism. The casing may be mounted in a door handle or on the lid of an automobile rear compartment in any suitable manner, and for this purpose is provided with radial ears Ill or other appropriate mounting means.

Rotation of the lock cylinder is transmitted to a latch mechanism (not shown) by means of a driving or operating shaft H. tion between the lock cylinder and the driving shaft comprises an axial rearward extension l2 at the rear of the lock cylinder having a rearwardly and laterally opening cavity l3 in which the front portion of the driving shaft is received. This extension is integral with and thus comprises a part of the lock cylinder, and the front portion of the cylinder, comprising the lock mechanism, will be referred to herein as the cylinder body.

As best seen in Figure 7, this extension is substantially coaxial with the cylinder body and has a smaller diameter than the cylinder body to thus define a rearwardly facing shoulder M on the rear of the lock cylinder body. The cylinder is insertable into the casing bore from its front, in a manner to be described presently, and the shoulder I4 cooperates with a circumferential rib l5 which extends part way around the bore of the case, at the rear thereof (see Figure 6), to preclude axial rearward displacement of the cylinder out of the casing.

Axial forward displacement of the lock cylinder out of the casing is prevented by a bayonet lug l6 which projects radially from the extension on the lock cylinder and has its front face I! spaced from the shoulder [4 a distance equal to the width of the rib l5. Since the rib extends only part way around the circumference of the case bore, it will be seen that the rib and the bayonet lug l6 cooperate to define a bayonet connection between the lock cylinder and easing. As will be later described in greater detail, after the lock cylinder has been moved into its assembled position in the casing, defined by engagement of the shoulder l4 with the front face of the rib, establishment of the bayonet connection involves rotation of the cylinder in one direction (counterclockwise as seen from the front of the lock in the embodiment illustrated) past the free end l5 of the rib to engage the lug over the rear face thereof.

A stop lug l8 projects rearwardly from the back of the case at the other end of the rib, and one of the longitudinal faces l9 of the stop lug cooperates with a face of the bayonet lug 16 to define the limit of counterclockwise rotation of the lock cylinder.

As will be seen presently, the other longitudinal face 2| of the stop lug l8 cooperates with a part on the driving shaft to provide a stop defining the limit of clockwise rotation of the lock cylinder to preclude its rotation to a position at which the bayonet connection is disengaged.

The lock cylinder is biased to its counterclockwise limit of rotation, which constitutes its neutral or key-receiving position, by means of a coiled torsion spring 26 which surrounds the extension 12 and the front end portion of the driving shaft The connec- .4 l I to thus also retain the shaft in position in the cavity I3 in the extension.

The spring comprises several concentric loops of steel wire. Its end portions are bent into an outwardly curved hook 21 and an inwardly curved hook 28, on its front and rear loops respectively. An arm 30, extending rearwardly from the case, has a hook 3| at its rear end, and the outwardly bent hook 21 on the spring engages therein, while the inwardly bent hook 28 at its other end engages around a tit-like lug 32 on the rear of the extension [2. The hook 3| on the case and the tit-like lug 32 on the rear of the cylinder extension are circumferentially spaced at opposite sides of the lateral opening of the cavity so that the torsional tension of the spring also tends to draw it toward the side of the cylinder extension to which the cavity opens.

' Short flanges 35 at the rear of the extension, adjacent the rearward opening of the cavity [3, provide forwardly facing shoulders against which the rearmost coil of the spring engages to preclude rearward displacement of the spring. These flanges, together, extend only part way around the circumference of the extension, to enable them to clear the rib 15 as the lock cylinder is inserted into the case, as will be explained in detail hereafter.

The driving shaft II comprises a fiat substantially L shaped member which may be readily fabricated as a stamping. The stem 23 of the L extends rearwardly from the extension toward the latch mechanism to be actuated and is normally held substantially coaxial with the lock cylinder, but it is obviously desirable that the connection between the driving shaft and the lock cylinder be such as to permit the rear of the shaft to swing in any direction to a limited extent to compensate for any misalignment between the lock mechanism and the latch mechanism to be driven thereby. To this end the connection between the driving shaft and the lock cylinder comprises a slot or cavity 13 in the extension on the lock cylinder, which cavity opens to the rear and radially to one side of the extension and in which the front end portion 25 of the driving shaft, comprising the cross member of the L, is received.

The longitudinal or side walls 37 of the cavity are spaced farthest apart at the rear of the extension and converge forwardly, being substantially parallel to one another at the front of the cavity, where they are spaced apart a distance slightly greater than the thickness of the driving shaft, so that the front portions of the' cavity side walls constrain the driving shaft to rotate with the lock cylinder; The divergent rear portions of these walls (best seen in Figure 2) enable the driving shaft to be rocked flatwise from ,side to side. The bottom Wall 38 of the cavity is substantially straight and parallel to the lock cylinder axis, as best seen in Figure 8, and since it is normally engaged by the straight adjacent side edges of the shaft, the latter is held in a position in which its stem extends straight rearwardly from the lock cylinder, the depth of the cavity being such that the center line of the stem substantially coincides with the axis of the lock cylinder when the, driving shaft is in its normal position.

The front end portion of the driving shaft is deep enough to project radially out of the cavity a substantial distance, and has a shallow slot 39 in its projecting portion, the bottom of the 'slot being parallel to the axis of the shaft and asss ozs its axial T length being =such as to snugly accommodate the coils of=the-spring 26. The front of the slot defines a rearwardly facing shoulder 4|]. which engages against the front'coil of the spring to preclude axial displacement of the driving shaft out of the'slot.

Since the spring surrounds the extension and lies across the driving shaft, in the slot'39 therein, radial displacement of the shaft out of the cavity is also blocked by the spring, although its resilience permits the above described swinging motion of the shaft. In this connection it will be noted that the extension has a reduced diameter in the neighborhood of the cavity opening to enable the spring to seat firmly in the bottom of the slot 39 in the driving shaft. Itwill also be observed that the stop lug l8 has its rear end notched, as at 4|, to clear the'spring and to provide a ledge 4| which overlies the spring 'to-steady it to a certain extent.

A forwardly extending foot 42 on thefront portion of the driving shaft overlies a ledge 43 on the extension, immediately behind the shoulder M on the lock cylinder body, and engages the ledge to limit edgewise swinging motion of the shaft about the transverse bottom wall of the cavity as a fulcrum (in the direction indicated by the broken line in Figure 8) to thus prevent the shaft from'being cocked to a position in whichthe front coil of the spring can ride up the lock.

The radial projection on the shaft which defines the shoulder 40 and which carries the foot '42 also serves as-anabutment whichcooperates with the face 2lof the stop lug opposite to that engaged by the bayonet lug to define the limit of clockwise rotation of the lock'cylinder and thus prevents rotation of the cylinder to a position in which the bayonet connection between it and the case is disengaged.

Assembly of the lock of this invention is extremely simple. The-cylinder is inserted at the front of the case with the flanges 35 at the rear of the extension held in the position shown in Figure 9 relative'to the case, i. e; out of alignment with the rib 15 so as to clear the same as the cylinder is moved rearwardly. As the cylinder is inserted'into'the case in this position,

the bayonet lug It eventually engages the front face of the rib l5,'and at this point the cylinder is rotated clockwise (as viewed'from the front) to enable the bayonet lug to be passed .around the free end of the rib. The'cylinder may then be moved rearwardly until the shoulder M on the'rear of the cylinder'body engages the front face" of the rib, after which the cylinder is rotated counterclockwise to'engage the bayonet connection. It'willofcourse be understood that the key is left in thecylinder during this operation to retract the sidebar of the cylinder and to facilitate rotation thereof. Next, the front portion of the driving shaft is slipped into the cavity and the 'ends of the spring-are then hooked into place on the lug 32 on the extension and the hook 31 on the arm 30, respectively, tocomplete the assembly of the lock.

From the foregoing description, taken together 6 with the accompanying' drawings, it will be readily apparent'that this invention provides an unusually s-imple pillar lock having a driving shaft-which is connected with the lock cylinder in a manner-providing a degree of universal motion, tothereby accommodate any misalignment between the lockandlatch mechanism to be actuatedthereby. "lt will also be seen that the lock-of this invention is extremely inexpensive to manufacture by reason of-the fact that the driving shaft may be=fabricated as a stamping; because both the casing and-the cylinder may be "made as-relatively simple die castings which do not involve complicated coring; and also becauseassembly of the lock may be very readily accomplished without special tools.

W-hat'I claim as myinvention is:

1. In a lock of the type having a boredcasing and-a-key-actuated lock cylinder rotatable in the casing boreand-accessible at the front thereof for insertion of a key: a rearward extension comprising the rear portion of the lock cylinder projecting behind the casing and having a cavity opening totherear and radially to one side of the extension; a driving shaft having its front-end portion received in said cavity to estabspring and its foremost coilabutting said'shoul- "der on thedriving' shaft to "preclude-rearward and radial displacement of theshaft out of the cavity while permitting limited angular displacement of the shaft with respect to the axis of the cylinder, said spring havingits ends connected with the case and'with the extension tothereby biasthe lcckc'ylinder in one direction of rotation.

2. A look mechanism comprising: a boredcasing; a lock cylinder rotatable in the casing; cooperating means on the casing and the lock cylinder-precluding withdrawal of'the cylinder from the casing except upon rotation of the. cylinder to a predetermined position; a driving "shaft; a connection'between-the driving shaft and the cylinder constraining the driving shaft to rotate with the cylinder; and cooperating abutments on the'driving shaft and the casing for precluding'rotation:rof the cylinder to said predeterminedfposition to thus preclude withdrawal of .the cylinder-fro'mthe casin as long as" the-shaft remains operatively connected with .the cylinder.

3. In a lock of. the type having a bored casing and a keyactuated Iockcylinder rotatable in the casing/bore and accessible at the front thereoffor insertionof a key: cooperating means on the. casing and on thelock cylinder providing a bayonet connection between the'cylinder and "the casing, precluding forward axial displacement of .the. cylinder. out-of the casing except upon rotation- 0f the cylinder in one direction to a. predetermined position-. with, respect to the casing; cooperating radial shoulders on thecylinder and "the casing providing a stop to define the'limit of rotation of the cylinder in the other direction; a rearward extension comprising the rear portion of the lock cylinder projecting behind the casing and havinga cavity therein opening to the rear and radially to one side of the extension; a driving shaft having its front end portion nonrotatably received in said cavity in the extension to establish a driving connection between the driving shaft and the cylinder and projecting rearwardly from the extension; a lug on said front end portion of the driving shaft extending radially beyond the surface of the extension; a rotation stop on the case with which said lug on the driving shaft is engageable during rotation of the lock cylinder in said first named direction to preclude such rotation of the cylinder to said predetermined position in which it may be withdrawn axially forwardly from the casing as long as the shaft is drivingly connected with the cylinder; and means securing the driving shaft in said cavity in the extension.

4. In a lock of the type having a bored case and a key actuated lock cylinder rotatable in said case and accessible at the front thereof for insertion of a key: cooperating means on the case and on the lock cylinder defining a bayonet connection precluding axial withdrawal of the lock cylinder forwardly out of the case except in a predetermined position of rotation of the cylinder relative to the case; a rearward extension comprising the rear portion of said lock cylinder projecting behind the case and having a cavity opening to the rear and to one side of the extension; an elongated driving shaft having its front end portion nonrotatably received in said cavity to establish a driving connection between the lock cylinder and the driving shaft and projecting rearwardly from the extension; means on said front portion of the driving shaft and on the case defining cooperating abutments engageable upon rotation of the look cylinder toward said predetermined withdrawing position thereof to stop such rotation of the cylinder before it reaches said predetermined withdrawing position, whereby the cylinder is held against forward axial withdrawal as long as the shaft remains connected to the cylinder; and means securing thedriving shaft in said cavity in the cylinder extension.

5. In a lock of the type having a bored casing and a key actuated lock cylinder rotatable in the casing bore and accessible at the front thereof for insertion of a key: a rearward extension comprising the rear portion of the lock cylinder having a cavity opening to its rear and to one side thereof, and substantially rectangular in cross section; a driving shaft having a substantially rectangular front end portion substantially loosely received in said cavity in the extension to establish a rotation transmitting connection between the lock cylinder and the shaft, which connection affords the shaft a degree of universal motion relative to the cylinder; a radial projection on said front portion of the driving shaft providing a shoulder extending from the side of the cavity and facing rearwardly; a forwardly facing abutment on the side of the extension at the rear thereof; and a coiled spring surrounding said extension and interposed between said abutment thereon and said shoulder on the driving shaft to thereby preclude rearward displacement of the driving shaft while permitting the driving shaft to be swunga limited degree about its front end portion to compensate for 8 misalignment between the lock casing and a part to be driven by the driving shaft.

6. The lock of claim 5, further characterized by the fact that said spring is connected with the extension and with the lock casing and biases the lock cylinder in one direction of rotation.

7. The lock of claim 5, further characterized by the fact that said spring yieldingly urges a straight longitudinal edge on the driving shaft into flatwise engagement with a wall of the cavity to thereby normally hold the driving shaft coaxial with the lock cylinder but enabling it to be swung about its front end portion.

8. In a lock of the type having a bored casing and a lock cylinder rotatable in the casing: a driving shaft; a circumferential rib on the easing extending part way around the casing bore at the rear thereof; said lock cylinder including a rearward extension, said extension having a diameter smaller than that of the body of the lock cylinder so as to define a rearwardly facing shoulder on the back of the lock cylinder body and having a radial projection spaced rearwardly from said shoulder and cooperable therewith and with the rib on the casing to preclude axial displacement of the cylinder in the casing; a connection between the driving shaft and the extension constraining the shaft to rotate with the cylinder; cooperating stop means on the cylinder and casing precluding rotation of the cylinder in one direction beyond one end of said rib; and means on the driving shaft cooperable with a part on the casing to preclude rotation of the cylinder in the other direction to a position at which said radial projection on the cylinder extension is carried beyond the other end of said rib.

9. In a lock of the type having a bored casing in which a key actuated lock cylinder is rotatable and accessible at the front thereof for insertion of a key: a circumferential rib on the casing extending part way around the casing bore at the rear thereof; a rearward extension comprising the rear portion of the lock cylinder, the junction of the body of the cylinder and said extension defining a rearwardly facing shoulder engageable with the front face of said rib to preclude rearward displacement of the lock cylinder; an outward radial projection on the side of said extension spaced from said shoulder and cooperable with the rear face of said rib to define a bayonet connection between the lock cylinder and the casing precluding forward displacement of the cylinder from the casing as long as said projection remains behind said rib; an abutment fixed on the casing and engageable by said projection to limit rotation of the lock cylinder in the direction to carry said projection beyond one end of said rib; an operating shaft including a part nonrotatably received in a radially opening well in said extension and projecting radially from the lock cylinder; means defining a second abutment on the casing engageable by said part to preclude rotation of the lock cylinder in the direction to carry said projection beyond the other end of said rib; and means for retaining said part in position in said Well in the extension.

10. In a lock of the type having a bored casing and a key actuated lock cylinder rotatable in the casing bore and accessible at the front thereof for insertion of a key: cooperating means on the casing and on the lock cylinder providing a bayonet connection between the cylinder and the casing precluding axial displacement of the cylinder out of the casing except in one position of rotation of the cylinder; cooperating radial shoulders on the cylinder and the casing providing a stop to define the limit of rotation of the cylinder in one direction; an operating shaft includa part nonrctatably secured to the lock cylinder and projecting therefrom; and means on the case defining an abutment against which said part engages to provide a stop defining the limit of rotation of the lock cylinder in the opposite direction, said limits of rotation of the lock cylinder being so-disposed that the bayonet connection between the lock cylinder and the case is engaged at all positions of lock cylinder rotation.

11. In a lock: a bored casing open at its front and rear ends; a loci: cylinder rotatable in the casing bore and accessible at the front thereof for insertion of a key, said cylinder having a cavity opening to its rear and radially to one side; a driving shaft having its front end portion received in said cavity; a rotation transmitting connecticn in said cavity between the lock cylinder and the front end portion of the driving shaft; means torsionally biasing the lock cylinder in one direction of rotation comprising a'coiled torsion spring encircling the rear end portion of the lock cylinder and having its end portions connected with the cylinder and the casing and its coils encircling the front end portion of the shaft to preclude lateral displacement thereof from the cavity in the rear of the cylinder; means on the lock mechanism to preclude rearward displacement of the spring; and means on the front end portion of the shaft projecting laterally out of the cavity and engaging a part of said spring to preclude rearward displacement of the shaft.

12. In a look: a "bored casing open at its front and rear ends; a lock cylinder rotatable in the casing bore and accessible at the front thereof for insertion of a key, said cylinder having a cavity opening to its rear and radially to only one side; means torsionally biasing the lock cylinder in one direction of rotation comprising a coiled torsion spring encircling the rear end portion of the lock cylinder and having its end portions connected with the lock cylinder and the casing and its coils larger than the diameter of the portion of the cylinder which it encircles and extending across the lateral opening of the cavity, the connections between the end portions of the spring and the cylinder and casing being so disposed that torsional bias of the spring tends to pull its coils toward the side of the lock cylinder to which the cavity opens; a driving shaft having its front end portion received in said cavity and having a side portion projecting laterally from the cavity and holding the coils of the spring spaced from the adjacent portion of the cylinder so that the spring blocks lateral displacement of the shaft out of the cavity; and a rotation transmitting connection in said cavity between the lock cylinder and the front end portion of the driving shaft.

13. In a lock: a bored casing open at its front and rear ends; a lock cylinder rotatable in the casing bore and accessible at the front thereof for insertion of a key, said cylinder having a cavity opening to its rear and radially to only v one side; a coiled torsion spring encircling the rear end portion of the lock cylinder, the coils of said spring being larger than the diameter of the portion of the cylinder which it encircles; cooperating means on the front convolution of the spring and on the casing, circumferentially spaced to one side of the radial opening of the cavity in the cylinder, anchoring one end of the spring to the casing; cooperating means on the rear convolution of the spring and i n the cylinder, circumferentially spaced to the other side of said radial opening, anchoring the other end of the spring, under tension, to the cylinder, so that the spring biases the cylinder in one rotational direction and so that the coils of the spring tend to be pulled toward the side of the lock cylinder to which the cavity opens; a driving shaft having its front end portion received in said cavity and having a side portion projecting laterally from the cavity and holding the coils of the spring spaced from the adjacent portion of the cylinder so that the spring blocks lateral displacement of the shaft out of the cavity and so that said projecting side portion of the shaft holds the spring with its convolutions coaxial and with its axis parallel to that of the cylinder; and a rotation transmitting connection in said cavity between the lock cylinder and the front end portion of the driving shaft.

14. The lock of claim 13 further characterized by axially spaced opposed abutments on said projecting side portion of the shaft engaging the front and rear convolutions of the spring to define a laterally opening notch in which the coils of the spring are received to further stabilize the spring in a position in which its coils are coaxial and its axis is parallel to that of the cylinder, and so that the spring precludes axial displacement of the shaft out of the cavity.

15. The lock of claim 13 further characterized by a rearwardly facing abutment at the front of said projecting side portion of the shaft against which the front convolution of the spring engages and a forwardly facing abutment at the rear of the cylinder against which the rear convolution of the spring engages and which cooperates with the anchored rear end of the spring to preclude rearward displacement of the spring and thus preclude rearward displacement of the shaft.

16. The lock of claim 13, further characterized by the fact that the cavity in the cylinder has a flat longitudinal wall and the front portion of the driving shaft has a fiat side surface, opposite said projecting side surface, which is held in flatwise engagement with said flat longitudinal wall of the cavity by the force of said spring to thus yieldingly hold the shaft axially aligned with the cylinder.

EDWARD N. JACOBI.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,567,701 Briggs et a1 Dec. 29, 1925 1,700,858 Segal Feb. 5,1929 2,004,435 Jacobi June 11, 1935 2,246,781 Dall June 24, 1941 2,348,135 Jacobi May 2, 1944 FOREIGN PATENTS Number Country Date 606,328 Germany Nov. 29, 1934 

